Stone sawing machine



(No Model.) 3 Sheets- Sheet .1. D. D. DRUMMOND. STONE SAWING MAGHINE.

Paten-ted Mar. ll, 1890.

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(No Model.) 3 Sheets-Sheet 2.

D. D. DRUMMOND. STONE SAWING MACHINE.

No.\423,3'78. Patented Mar. 11, 1890.

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Y NO. 423,378.

Y Patented Mar. l1. 1890.

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UNITED STATES PATENT VOFFICE.

DAVID D. DRUMMOND, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TO LAURITZI. LARSEN, OF SAME PLACE.

rSTONE-snwllae MACHINE.

SPECIFICATION forming part of Letters Patent No. 423,878, dated March11, 1890.

Application led December 23,1889. Serial No. 334,622. (No model.)

To @ZZ whom t may concern:

Be it known that I, DAVID D. DRUMMOND, a citizen of the United States,residing at Chicago, county of Cook, State of Illinois,have iny 5 Venteda new and useful Improvement in Stone-sawing Machines, of which thefollowing is a specification.

My invention relates to that class of machines in `which the saws arestrung across to between the frames of a sash which oscillates orreciprocates back and forth horizontally; and the object of my inventionis to provide a mechanical movement capable of giving to the saidoscillating frame a more even and perfect motion than has beenheretofore given it. In the machines now in use the sash which carriesthesaws is usuallysuspended from hangers at each corner, which permitthe frame to be swung back andforth like a 2Q pendulum, giving it ofcourse a motionthe lowest point of which is in the middle of eachoscillation, and bringing the saws in contact with the stone that isbeing cut at that point, and being raised away from it at each end of 25 the oscillation but it is found that this motion of the frame givesthe saws too short a contact with the stone for most effective cutting.Parallel motion and rollers have been tried,but in these the difficultyof raising the saws at the end of each stroke in order to allow thecutting material to get under them must be overcome. My invention aimsat prolonging this contact and still raising the saws sufiiciently atthe end of each stroke, 3 5 and this I accomplish by means of a systemof cams and eccentrics and levers, as hereinafter described, andparticularly pointed out in the claims.

Figure 1 is a sectional view of my machine, taken on line a; a', Fig. 2.Fig. 2 is a sectional end view of same on line c z, Fig. l. Fig. 3 is adetail view of a part of the machine, showing the hangers and the shaftsfrom which they are suspended and the pins by which they are attached tothe sash. Fig. 4

is a detail view of the cam, segment, and pinion by which the eccentricis actuated. Fig. 5 is a plan view of the same, taken on line y g/,FighFig. 6 is a detail view of the eccentries, hangers, connecting-rod, andsash.

A represents the frame of the machineg-B,

the stone to be operated upon; C, the sash in which the saws S arestrung.

` D D are the hangers by which the sash is suspended. 55

E is the pitman by which the sash is reciprocated.

F F are the gears which drive the feedscrews I I.

I-I H are the eccentric bearings fixed upon 6o the axles or'shafts .I J,and from which the hangers D D are suspended.

P P are the pins by which the hangers are attached to the sash C at eachcorner.

O O are arms integral or attached to the eccentrics, and N is aconnecting rod by which all the eccentrics are moved simultaneously.

L is a grooved cylinder or cam upon the I shaft K. 7o

M is a toothed segment pivoted at Q upon the crosshead R.

G G are the guides upon which the crossheads R R slide.

K is a feather way or spline ou shaft K in which a feather upon the camL slides, allowing it to slide longitudinally, but not to turn upon theshaft. I

-V is a groove in the cam L in which the stud WV on the segment M runs.The seg- 8o ment M. meshes with the pinion T, and by the rotation of thecam L, having the groove V, in which the stud W runs, the pinion T isrevolved, and thereby the eccentric I-I, integral with or attachedthereto. The groove in 8 5 the cam is so shaped and the rot-ation of thecam so timed by the chain-wheel or otherpositive motion which drives itthat as the sash C advances in its oscillation out of the perpendicularposition shown in Fig. 6 the ec- 9o centric bearings I'I II, from whichthe sash is suspended, revolve sufficiently to lower the point ofsuspension, as seen in Fig. l, keeping the sash at the same heightthroughout the stroke, and giving it ahorizontal motion. lVhenA thepitman E reaches the position shownin Fig. 1 and its forward motion isabout over, and while it is passing the dead-center, and the desiredlength of contact between the saws and the stone is reached, the revo-Ico lution of the cam brings the arms O O into their vertical position,again raising the eccentric bearings and allowing the cuttingfmay terialtogetf beneath the saws. zThen by the time the return-stroke is about tobegin, or as soon as it is well under way, the rotation of the cam willhave swung the arms O O back to the opposite position to that showni-ruFi'g.I 1,?and'v the same process 4gone through? in the reversedirection. :Thus it .will Avbe seen that during each complete forwardand back stroke of the saws the arms O are in the. Vertical positionfour times once 1vat Aeaeh end and twice in the middle of the stroke.

The form of the cam L determines the move-g l ment of* the eccentricbearings,A and maybe so varied as to give aY longer or shorter con.utact of the saws or a greater or less clearance at each-endof thestroke, .as desired. Ido; not wish to limit myself in this respect.A-l'soy in place .ot thesegmentMand pinionfl a-'lever may besubstituted, one end' beingattached, to the eccentricand the otherrunning in the grooveof the cam. This same object, namely-, theraising-and: lowering atwill of the point of suspension of thehangers--may'also'beaccomplished by means of a ixedlever, one lend of-`which.engages the cam and.I the other. end carries theVhanger-journals; but in. this latter method theleverfwould simply bethe equivalent of my eccentric Theeccentrics are fixed upon the shaftsJLandi they-armsvv O` O, connected by the rod-N so that theynall moveltogether; but I dof not consider this' an essential feature of myinvention, as4 other suitable connectionfmaybe used for moving themsimultaneously.

`Thefeed mechanism ofthe machine is of the :usualfform @Thefeedaserews'v I, driven by anyvsuitable mechanism, as the gears F, passadvancedas the stone isl cut.

=The cross-headR is extended to form journals for the shaft K and a yokefor the cam L. The cam advances with the cross-heads sliding in; the`spline K.

i/Vhat I claim, and desire to secure by Letters Patent, is-

1."The herein-described stone-cutting machine,consisting of i' thecombination of the oscillating frame carrying the saws, the hangers bywhich said frame issuspended, the eccentric bearingsy from -Whiehsaidlhangersare suspendedfthe f adj ustable. cross-heads upon whichsaid`eccentric bearingslare.locatedgand 1 the 'camfsegmentaan'df pinioncarried by'said 1 cross-head, byrw-hieh said-eccentric bearings .arerotated, all substantiallyasfshown and described. v

2. The herein-described stone-sawlngmachine, consisting of thecombination of y the yoscillatin g frame C, hangers lD; D, eccentricbearings. H H, cam iL, segment M, pinion lT,

y arms O O, connecting-rod N, feed-.screwsIL splinedshaft K, and'cross-heads R5 R', allsubstantiallyzas-.shown .and described.

fDAVID 2D. ifDRUMMOND. .Witnesses: v

WMM.LEfLll/IQYNE, `1LoU1srV..;LE aMoYNE.

